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A charged rod having charge as shown is rotating with angular velocity $ω$ about on hinge at its centre. At the instant shown rod is along $x$ -axis. Consider effect of field at the instant shown.

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A magnetic field $B_{0} \hat{i}$ will slow down rod.

An electric field $E_{0} \hat{j}$ will slow down rod.

A magnetic field can not slow down the rod.

An electric field $E_{0} (- \hat{j})$ will slow down rod.

answer is C, D.

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Detailed Solution

1)Magnetic force is $⊥$ inward on right half and outward on left body. It is constrained so no effect.

2)Torque of electric force increases $ω$ .

3) Torque electric force decreases $ω$ .

4) Rod will slow down only if force on any element is opposite to velocity magnetic force is always $⊥$ to velocity vector.

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